Is it possible to get a seizure while under anesthesia?

Yes: Although rare, it may happen as a reaction to the meds or as a random occurance.

Yes: Eeg evidence of seizure activity during deep general anesthesia has been seen in patients known to have epilepsy.

Unlikely: Many of the medications used in anesthesia--especially those in the Valium family (benzodiazepines)--actually work to prevent seizures. If you have epilepsy, be sure to tell your anesthesiologist and take your medications on schedule before surgery with a sip of water. None of the anesthesia gases or other medications in current wide use are likely to provoke a seizure.

No: Most general anesthetics are actually protective against seizures. In cases of status epilepticus they actually use anesthetics to break the seizures.